Projecting onto an upper surface of a body of water

ABSTRACT

A projection system for projecting light such as images or content upon a liquid surface such as a lake or pool surface. The system includes an agitation assembly selectively operable to agitate a portion of the upper surface of liquid to form a projection screen. The system includes a projector assembly projecting or focusing light onto the projection screen on the upper surface of the liquid. The liquid is translucent to light, but the projection screen on the upper surface reflects a portion of the projected light due to the agitation. The agitation assembly may include an aeration system with a distribution manifold and is positioned below the liquid surface and has outlets discharging gas into the liquid such that air bubbles for the screen. The manifold outlets may be provided at two or more depths, whereby two or more portions of the projection screen are generated at differing times.

REFERENCE TO RELATED APPLICATIONS

This application is a continuation of U.S. patent application Ser. No.13/102,701, which was filed on May 6, 2011, entitled “System and Methodfor Projecting Onto an Upper Surface of a Body of Water,” which ishereby incorporated by reference in its entirety.

BACKGROUND

1. Field of the Description

The present description relates, in general, to visual display andprojection systems, and, more particularly, to a method and system forprojecting light, including still and video images, onto a body of water(or other liquid) such as in a pool or channel such that a display isprovided on the upper or outer surface of the water, even though wateris transparent or at least translucent to light.

2. Relevant Background

There is an ongoing demand for ways to create visually interesting andexciting displays that involve water. Throughout the world, fountainshave been developed and installed that entertain spectators with jetsand fans of water that have unique shapes. The fountains may even beoperated in time with music and a light show to provide a unique,choreographed display. In some indoor displays, mist screens have beenused to provide a curtain that can be used as a display surface usingrear projection systems, and such display systems have been usedregularly at large trade shows and other events to provide aninteresting way to present information and to entertain a crowd.

In contrast, though, larger bodies of water present a more difficultchallenge for the designer of a display. For example, a designer maywish to use a body of water in a pool or pond to display light or media(e.g., a video or still image from a projector) or may wish to displayimages in a channel of a water ride as a boat/vehicle carryingpassengers travels through the water. The upper surfaces of these bodiesof water are generally planar or smooth, and water is generallytransparent or at least translucent to light. As a result, lightprojected onto the surface of these bodies of water is reflected wellonly at a specific, narrow angle with most of the incident light beingtransmitted rather than reflected, resulting in a large percentage ofthe incident light traveling through the water to the bottom of the poolor channel containing the water. At this point, the light may bereflected upward off the bottom to be viewed by spectators (e.g., peopleon or nearby the body of water).

A display on the bottom or sides of the pond/channel is generally notdesirable as the projected content, such as a still image or video,appears to be on the bottom of the pool/channel. This may make the imageunclear or distorted as it has to be viewed through a depth of waterwhich detracts from its clarity. Further, lighting the bottom of thepond/channel often will be undesirable as this may reveal equipment suchas pumps and nozzles used to create a fountain or a track used to move aboat through an amusement park ride. Additionally, these lower surfacesunder the water often are not useful for reflecting light in apredictable or desirable manner such as the bottom of a natural lake orriver that may have a bottom covered with mud, rocks, and plants. As aresult, the surfaces of lakes, ponds, and rivers (all of which may bemanmade such as a channel defining a river of water for an amusementpark ride) have previously not been used as display surfaces forlight-based shows or projected media.

SUMMARY

Briefly, the following description teaches systems and methods forprojecting on surfaces of liquid such as upon the surface of a pond, afountain, a river or water in a channel (such as an amusement parkride), or other body of water. The inventors recognized that althoughwater is translucent or transparent to light that a projection surfaceor “screen” can be formed on an upper surface of a body of water byadequately agitating or disturbing the surface to create a diffusereflecting surface. This agitated or roughened portion of the uppersurface then will reflect a significant fraction of the projected lightover a wide range of viewing angles to an observer rather than simplyallowing the light to be transmitted to the bottom of the body of water.

In a tested embodiment, a projection system is provided that includes aprojector assembly, such as a conventional video projector or lightsuseful for providing a light or laser show, and a surface agitationassembly in the form of an aeration system. The distribution or outletmanifold of the aeration system is positioned within the body of waterat some depth (with deeper positioning generally providing a moreuniform distribution of bubbles). A control or inlet valve is operatedto feed pressurized air (such as at 5 to 40 psi or higher) to thedistribution manifold, and the air is ejected from outlets, holes,pores, and/or nozzles of the manifold (or its disks, tubes, or thelike). The ejected air rises in the form of numerous bubbles to theupper surface of the body of water, and these bubbles agitate thesurface of the water and/or provide reflective spheres. As a result, asignificant fraction of the light from the projectors that is focused onthe projection surface/screen formed above the distribution manifold isreflected such that the projected content (such as still or videoimagery) is visible by nearby spectators (e.g., passengers of a boatfloating through or near the projection surface in the body of water orobservers on the bank/shore).

More particularly, a projection system is provided for projecting orfocusing light or images (content) upon an upper surface of liquid. Thesystem includes an agitation assembly selectively operable to agitate aportion of the upper surface of liquid to form a projection screen. Thesystem also includes a projector assembly projecting or focusing lightonto the upper surface of the liquid. The liquid is at least translucentto light (e.g., is water or other translucent to transparent liquid),the projection screen on the upper surface reflects a portion of theprojected light due to the agitation (whereas other non-agitatedportions of the upper surface do not reflect a significant portion ofthe light).

In the system, the liquid may be water in an open container (a channel,pool, basin, or the like) and the upper surface is substantially planar.In some embodiments, the agitation assembly includes an aeration systemwith a distribution or outlet manifold with outlets discharging gas intothe liquid. The manifold is positioned a depth below the upper surfaceof the liquid (e.g., 1 to 6 feet or more with 6 to 10 feet being usefulin some cases).

The aeration system may include an inlet valve selectively operable(such as by a controller also operating the projection assembly) toprovide pressurized gas to the manifold, whereby the projection screenis selectively generated and removed from the upper surface. The outletsof the manifold may be provided at two or more depths, whereby two ormore portions of the projection screen are generated at differing timesupon activation of the agitation assembly. In this regard, the manifoldmay be substantially planar (e.g., a plurality of side-by-side pipes ortubes) and is positioned within the liquid to be transverse to the uppersurface such that a first end of the manifold is at a first depth and asecond end of the manifold is at a second depth greater than the firstdepth.

The aeration system is fluidically connected to an air supply providingair at a pressure such as a pressure of at least 5 psi or at least 30psi (to provide a high quality and more “dense” distribution ofbubbles). In the system, the projector assembly may include a projectorprojecting a still or video image upon the projection screen. In somecases, the system may include a vehicle floating on the upper surface ofthe liquid and the vehicle may float through the projectionsurface/screen. In some embodiments, the agitation assembly is mountedon the vehicle such that the projection surface/screen can be generatedanywhere the vehicle is located in the body of water.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a functional block or schematic diagram of liquid surfaceprojection system of an embodiment of the invention;

FIG. 2 is a perspective, cross sectional view of a projection systemthat may be used to generate and projection upon a projection screen ona water surface;

FIG. 3 illustrates the projection system of FIG. 2 during operation toproject images on the projection screen adjacent a passing vehicle(e.g., a passenger boat);

FIG. 4 illustrates a projection system similar to that shown in FIG. 3but with an alternative aeration system providing a differing projectionsurface/screen on the upper surface of the body of water;

FIG. 5 illustrates a liquid surface projection system similar to thoseshown in FIGS. 3 and 4 that includes an angled or sloped distributionmanifold to provide a projection surface that is formed and removed overa time period (rather than on/off);

FIG. 6 illustrates a liquid surface projection system similar to thatshown in FIG. 3 that includes a nozzle-based distribution manifold inthe aeration system; and

FIG. 7 illustrates another projection system similar to that shown inFIG. 6 that provides the aeration system on the passenger vehicle/boat.

DETAILED DESCRIPTION

Briefly, the present description is directed towards methods and systemsfor projecting light such as a laser show or images (video or still)from a projector upon a liquid surface for viewing by viewers orspectators. The liquid surface may be a relatively planar surface of abody of water, either still or flowing, in a basin, pool, channel, orother open liquid container, and the liquid may be water or some othertransparent (or at least translucent) liquid. A projection surface orscreen is created in a portion of this liquid surface that effectivelyreflects a significant portion of light from a projection device(s) toallow a viewer to see the images as reflected light. To this end, asurface agitation mechanism such as an aeration system may be used togenerate the projection surface within or as part of the liquid surface(e.g., numerous air bubbles act to reflect the projected light to aviewer). Numerous special effects may be created by controlling theoperation of the surface agitation mechanism, e.g., the amount or rateof agitation to create a sharper image or a hazier image, turning themechanism on and off quickly or slowly to present/remove an imagerapidly or with a fade in/out effect, and so on.

FIG. 1 illustrates in functional block (or schematic) form a liquidsurface projection system 100 that can be used to display images 166 toa viewer 170 using a surface 122 of liquid 120. The liquid 120 is atranslucent to transparent liquid such as water that typically has aplanar or still surface 122 that is not useful (without the system 100)for projecting light as it allows a large percentage of any receivedlight 160 to pass through it. For example, the projection system 100includes an open liquid container 110 such as a basin or pool or achannel (e.g., for a water ride). The liquid container 110 is open inthat it includes a bottom 112 and a sidewall(s) 114 extending up fromthe bottom to receive and retain a volume of liquid 120 but the liquid120 is exposed via the opening in the sidewall 114. Specifically, anupper surface 122 of the liquid 120 is open to the surroundingenvironment or air. The upper surface 122 typically is still orsubstantially planar (with some small amount of waves in some outdoorsettings or in a water ride or similar setting in which a wake may becreated by a boat).

During operation of the system 100, a projection surface or screen 124is formed on this otherwise smooth or planar surface of the liquid 120.To this end, a surface agitation (or disruption) assembly 130 isprovided in the liquid surface projection system 100. The assembly orprojection screen generator 130 functions to form an area of the surface122 that is useful for reflecting received light 160 to a viewer 170 asshown at 166 while adjacent portions of the surface 122 allow the light160 to travel through the liquid 120 (e.g., to strike the bottom 112 orsides 114).

In one embodiment, the surface agitation assembly 130 includes one, two,or more wave generators that may be useful for creating rows or across-hatch pattern of standing waves (or the like) or a surfaceroughness in projection surface 124 that reflects the received,projected light 160 to an adequate level to create a useful amount ofvisible light 166 viewable by a viewer. In other embodiments, thesurface agitation assembly 130 includes one or more aeration systemspositioned within the container 110 in the liquid 120 but a distance(e.g., 1 to 5 feet or more) below the surface 122. When the assembly 130is then operated, numerous gas bubbles flow to the surface 122 at thelocation (and in the shape/size) of the projection surface/screen 124 toform the surface/screen 124.

Numerous embodiments of an aeration system or device may be used topractice the system 100, and a relatively low inlet gas pressure (suchas low as about 5 pounds per square inch (psi) may be useful in somecases whereas higher pressures (up to 30 to 40 psi or more) may bepreferable in other settings) may be utilized to form the screen 124 bycausing numerous gas bubbles to flow through the surface 122. Likewise,the aeration tubing (or nozzles) may have many arrangements to provide adesired distribution of the gas bubbles (e.g., a simple soaker hose, atube with small holes, an arrangement with numerous fountain-likenozzles, an aeration stone like those found in fish tanks, and manyother arrangements may be used) and the density of such an aeration“manifold” may also be varied (e.g., distance between gasfeed/distribution lines and their arrangement in the container 110 maybe selected to provide a desired density of bubbles on the surface 122in the projection screen 124). In other words, the term distribution oraeration manifold is intended to be construed broadly and may includenearly any structure useful for generating air bubbles such as a diskdiffuser, a tube diffuser, a blower, or other devices often used inconventional aeration systems (such as pond/lake aeration systems, watertreatment facilities, and the like).

The projection system 100 further may include a controller 140 such as acomputer-based or similar electronic device that is useful for sendingcontrol signals 148 to selectively operate the surface agitationassembly 130. The controller 140 may include a processor 142 thatmanages operations of input and output (I/O) devices 144 such as amonitor, a touch screen, a keyboard, a mouse, and the like that allow anoperator to view operational information and to initiate operations ofthe projection system 100. The processor 142 may have memory and run oneor more display programs 146 that act to generate the control signals148. For example, a show or display may be defined by the displayprogram 146 that calls for selectively and periodically operating theagitation assembly 130 to form the projection surface/screen 124 (e.g.,only generate screen 124 when projected light 160 is provided and/orfade in and/or out the display of light 160 by turning the agitationassembly on and off in a rapid or gradual manner such as to providevarying amounts/sizes of spherical lenses (gas bubbles) or wavepeaks/intersections).

The projection system 100 further includes a projection assembly 150that is operable by the controller 140 (e.g., based on running thedisplay program 146 and/or based on manual inputs/selections by anoperator via I/O devices 144) transmitting control signals 158 (whichmay, in some cases, include the content/media 156). The projectionassembly 150 functions to project light 160 onto the projection surface124, and the surface 124 reflects a portion of the light 160 asreflected/visible light 166 to a viewer 170. The projection assembly 150may include one or more lights and/or lasers 152 to provide alight/laser show with light 160 (e.g., synchronized or random lightdesigns or patterns provided on screen 124). The projection assembly 150may also or instead include one or more projectors 154 that are used toprovide the projected light 160, which may include still or videocontent/media 156. For example, a still image of a character may beprovided on an amusement park ride, a marketing message may be presentedin a mall water feature, a video or animated image may be provided in apool or basin, and so on.

The inventors recognized that it is not possible to get a diffusereflection off a relatively smooth surface of water because water istransparent or at least translucent to light. Despite this hurdle, theinventors were attempting to provide a system that had the ability toproject directly on water that would facilitate incredible new shows,special effects, and interactive/gaming opportunities for designers ofwater rides, water-based attractions, and creativeentertainment/marketing structures using a pool/volume of water. Theinventors discovered that aeration of a water surface creates enoughsurface disruption such that the disrupted area or portion of the watersurface can be used as a projection surface. Specifically, the resultsof a scaled mock up were successful at demonstrating that colors,graphics, images (still and video), and text are readily discernable andreadable on the projection surface formed within the water surface.

Generally, the inventors have created a water surface projection system.One embodiment includes a pneumatic aeration system positionedunderwater (beneath the surface of a body of water in an open containersuch as a basin or channel). The aeration system is selectively operableby a controller to provide a plurality of small gas bubbles (e.g., auniform distribution of small air bubbles) over a desired projectionarea on the water surface. The water surface projection system alsoincludes a projection or lighting system directing a stream of projectedlight (with content in the form of colors, shapes, images, videos, andso on), and the projected light may be focused on the water surface inthe created projection surface/screen.

In the projection system, the pneumatic plumbing and control system maybe configured to allow an operator (or controller running a displayprogram) to, over a time period during a show/display, vary the airpressure and/or flow rate from zero to a maximum design pressure (e.g.,from 0 to 40 psi or higher). The aeration system may be mountedstatically in the water way or in the water container. In otherembodiments, the aeration system may be positionable by a control systemto move the projection surface (or change its shape and size) while inother cases the aeration system may be attached to a boat, vehicle, orobject that can move about the water basin or container so as toreposition the projection surface on the water surface.

The aeration system may include a source of pressurized air/gas and aporous material or tubing/manifold with numerous small outlets, and theair from the source is forced through the porous material or outlets ofthe manifold and gas bubbles float to the water surface. The aerationsystem may also include a constricted nozzle to output the pressurizedair to disrupt the water surface. The aeration system may be mountedsuch that its outlet tubing or manifold (which may include porousmaterial) is mounted in a flat or horizontal plane position (e.g.,majority of gas outlets are in a plane such that the bubbles aredischarged at a like or similar depth in the water). In otherembodiments, though, the outlet tubing/manifold is mounted at an anglesuch that the gas outlets are at differing depths so as to “activate” orcreate (and remove) the projection screen at differing times or in adirectional manner when the system is turned on and off (e.g., a leftside of the screen may be formed first by bubbles discharged at a first,shallower depth and a right side of the screen may be formed last bybubbles discharged at a second, deeper depth (and when the system isturned off the left side would disappear first, too)).

Many configurations of the water surface projection system may be usefulto practice the present invention, and one system 100 is shown in FIG. 1with other figures illustrating in more detail particular usefulembodiments. The aeration system may take many forms to provide aprojection screen by disrupting the surface of the liquid, e.g.,configured to create a volume of small, uniformly distributed bubblesover the desired projection area. The aeration system may be mountedanywhere under the water surface even on a moving boat or to bepivotable/positionable so as to move the projection surface through thewater. Interesting effects can be achieved as the aeration system startsup, shuts down, or is “pulsed” (e.g., bursts of bubbles separated by nobubbles) to effectively turn the projection surface on and off. This hasthe effect of revealing and dissolving the projected image/light in veryinteresting and organic ways and can be used (such as by operation ofthe controller) to create a unique and infinitely varying projectionsurface.

Testing of water surface projection systems using a scaled mock up hasproven that the projection surface is useful and works for a widevariety of lighting (background or environmental lighting as well asprojected lighting) and imagery. The testing has indicated that severaltechniques and/or design considerations may be implemented to hide thenature of the effect and prevent observers from identifying the surfacebubbles and/or their source (e.g., how the projection surface isgenerated in the projection system). For example, smaller diameterbubbles may be useful in providing higher image resolution (e.g., it maybe useful to use smaller outlets/holes in the outlet manifold of theaeration system). However, excellent results were obtained when a videowas projected onto a projection screen formed by pushing air through astandard garden soaker hose (e.g., a tube/pipe with numerousperforations or holes in its sidewall).

Additionally, it may be the case that placing the aeration system'soutlet manifold deeper provides a higher quality and more uniformprojection surface. In other words, nearly any depth may be useful but adeeper placement (such as 4 to 8 feet or more) may be more forgivingwhile a shallower placement may be improved by providing a tighter orhigher density grid/array of the manifold tubing/piping/porous material(e.g., denser arrangement of gas outlets when shallow placement isused). Further, high contrast imagery may work better for the projectioncontent (e.g., high contrast imagery on a black background). Forexample, bright text or lines on a black background have been shown tobe very easy to read when projected on a projection surface of thepresent invention. Typically, the overall light saturation or intensityis kept as low as possible. In some cases, moving objects or imagery mayprovide a more desirable image on the liquid projection surfaces whencompared with a stationary or still image since the image moves throughareas of local disruption caused by upwelling water moved to the surfaceby the rising bubbles.

FIG. 2 illustrates a perspective, sectional view of a water surfaceprojection system 200 of an embodiment of the invention. As shown, thesystem 200 includes a basin or pool (e.g., an open water container) 210that includes a base or bottom wall 212 and vertical sidewalls 214extending upward a distance defining a depth of the pool (or channelsuch as may be used for a water ride) 210. The pool 210 is filled with avolume of a translucent to transparent liquid 220 such as water to aboutthe depth of the pool 210. The liquid 220 has an upper surface 222exposed within the system 200, and the surface 222 may be generallyplanar or smooth, e.g., such that light projected onto surface 222generally will pass through the liquid 220 to strike the bottom wall 212and then be reflected.

However, the system 200 is shown during operation to generate or providea projection surface 224 on an area of the surface 222. Light (such as astill or video image or moving light patterns) is projected upon thesurface 224 with projectors/lights 254, and the projection surface 224has features such as a roughness in the form of spherical bubbles thatcause the light (or at least a substantial percentage such as up to 40to 60 percent or more) to be reflected. The projector 254 may be fedcontent by a media server (not shown) that may provide images, video,textures, and so on to the projectors 254 in a wired or wireless mannerto selectively display content (or projected light with content) on theprojection surface 224.

The projection surface 224 has a shape and size that is defined by themechanism used to disturb or agitate the surface 222, and, as shown, theprojection surface 224 is rectangular in shape with a width, W, and alength, L, both of which will typically be less than the width andlength of the pool but may be about equal to the entire availablesurface 222. Relatively large surfaces/screens 224 can easily beprovided similar to those used for projection screens in movie theatersor even larger while some embodiments may provide much smaller surfacessuch as a surface 224 the size of a television screen or smaller.

To generate the projection surface 224, the projection system 200includes an aeration system 230. Generally, the aeration system 230 maybe nearly any device that is adapted to put air or other gases into thewater 220 such as aeration units, air stones, nozzles, permeablemembranes, and so on connected to a pressurized air supply or source.The aeration system 230 performs to create small bubbles 238 frompressurized air. FIG. 2 shows only a portion of the bubbles 238 used toform the projection surface 224 (as most are removed for ease of showingthe aeration system 230 components but would extend throughout the water220 below the surface 224). Typically, the aeration system 230 isconfigured to provide relatively small bubbles and to evenly distributethem to provide a relatively high quality and uniform surface 224 (e.g.,bubbles that are 0.25 inches or less in diameter when they reach thesurface 222 with a density that is consistent across the surface 224(unless it is desired to provide a surface 224 with void areas ornon-reflecting/lower reflection portions)). In some cases, the smallerand more evenly distributed the bubbles 238 are the better theresolution of the image (e.g., like numerous pixels or sphericalmirrored surfaces reflecting the light to an observer).

As shown, the aeration assembly 230 includes an inlet valve 232 that isselectively opened/closed (and, in some cases, throttled) to controlflow of air from a pressurized air supply (not shown) into an inlet orfeed line 234. The inlet line (or regulated air inlet) 234 suppliespressurized air at a particular flow rate and pressure to a distributionmanifold (or array) 236. The distribution or outlet manifold 236 ispositioned within the pool or container 210 such as near the bottom 212or at some other depth. The manifold 236 is shown to be formed, in thisexample, of a plurality of linear tubes or pipes 237 arranged in aspaced apart but side-by-side manner (e.g., tubes or pipes 4 to 12inches apart or the like), and the tubes 237 extend across a portion ofthe bottom 212 (e.g., nearly the entire distance between sidewalls 214).

Again, the spacing between adjacent tubes/pipes 237 may be increasedwith increasing depth to obtain a similar uniformity in the bubbles 238,but a denser spacing of tubes 237 typically will provide a highersurface uniformity at a particular air pressure. In the illustratedexample, the tubes/pipes 237 of the manifold 236 are arranged in ahorizontal plane such that bubbles 238 from any tube 237 reach thesurface 222 in about the same amount of time. The size and shape of themanifold 236 is substantially matching that of the surface 224 (but,typically, somewhat smaller than the surface 224). The pressure used mayvary, and the inventors have tested pressures of 30 to 40 psi. Lower (ordiffering) quality but useful surfaces 224 may be achievable at muchlower pressures such as down to about 5 psi and at higher pressures. Thesystem 200 provides a relatively simple to design and operate waterprojection system. It has the added advantage that the projectors do nothave to be placed in the water 220 as was the case of some displays thatplaced display devices a depth below the water and tried to project outfrom a planar surface 222.

FIG. 3 illustrates the projection system 200 during its use to projectupon the projection surface 224. As discussed, the underwatergrid/manifold 236 provides an aeration array in the water 220. Air movesthrough the aeration grid/manifold 236 and the tubes/pipes with theiroutlets/holes convert the pressurized air into small bubbles 238 thatmay be uniformly distributed across the projection area 224. The bubbles238 move primarily vertically to the surface 222, and, due to locationof the manifold's outlet tubes/pipes in a horizontal plane, the surface224 is created and terminated as a unit (or throughout the area of thesurface 224 concurrently).

The projection system 200 is shown to be provided as part of a waterride as may be useful for an amusement park. In this application, avehicle in the form of a passenger boat 380 is shown to seat severalobservers or passengers 382, and the boat 380 is shown to be travelingor floating though the projection surface 224. A first pair ofprojectors 254 are used to project an image or light 355 upon theprojection surface 224 to provide an object or character (such as afish/shark) 356 that may move 357 about the boat 380 as it changeslocations on the projection surface 224 (or as the boat 380 moves 381through the surface 224).

A second pair of projectors 380 is used to project a video or light 382that provides an animated or moving image or design 384 on theprojection surface 224 near the boat 380 to be visible from the boat 380by the passengers 382. The moving image or design 384, for example, maysimply be enhanced bubbles (e.g., lighted or colored forms of thebubbles 238) or may take many other forms such as to cause the watersurface 222 to appear to be flowing lava. In this manner, a projectionscreen 224 can be selectively created (e.g., appear as a boat 380approaches), and the projection screen 224 does not interfere withmovement of the boat 380. The images 356 and 384 may enhance the ridesuch as by interacting with the passengers 382 or changing the “feel” ofthe ride such as by causing the passengers 382 to believe the boat 380is moving much faster in the water 220 by moving the projected imageryin an opposite direction than the boat 380 (e.g., relative speed of theboat 380 will seem to increase).

FIG. 4 illustrates another embodiment of a water surface projectionsystem 400 similar to that shown in FIG. 3. The system 400 includes anumber of the same components as system 200 of FIG. 3, and thesecomponents are given like numbers and not described further. Theprojection system 400 includes an aeration system 430 that has aninlet/control valve 432 and an inlet/feed line 434 providing a flow ofpressurized air.

The system 400 differs from system 200 in its configuration of thedistribution manifold or array 436. The manifold 436 includes atubing/pipe 437 with outlets/holes/pores/nozzles that release thepressurized air to form bubbles 438 in the water 220. However, thetubing 437 is arranged to provide a number of spaced-apart, concentriccircular patterns. In this manner, the tubing 437 provides bubbles 438that rise to the surface 222 of the water 220 and form a generallycircular-shaped projection surface/screen 424 above the manifold 436.The system 400 is useful for showing that the manifold 436 (or 236)shape and size generally defines the shape and size of the projectionsurface 424 (or 224), and nearly any size and shape projection surfacemay be formed upon a surface of a body of water. Such shapes may also becombined by providing two or more surfaces that overlap or that arespaced apart (e.g., the surfaces 224 and 424 could be combined toprovide a rectangular screen with a semi-circular end or the like).

Since the bubbles used to form the projection screens move primarilyvertically toward the surface, a horizontal manifold provides aprojection screen that is turned on and off (e.g., the vertically risingbubbles all reach the surface at about the same time across the area ofthe projection surface). The inventors recognized that by tilting thedistribution manifold, a projection surface can be activated in acontrolled direction or over time from end-to-end to create “wipe on”and “wipe off” transition effects.

To this end, FIG. 5 illustrates a liquid surface projection system 500,similar to systems 200 and 400, that includes a sloped distributionmanifold 536. The manifold 536 may take a configuration similar to thatof manifold 236 with a plurality of spaced-apart, linear tubes/pipes 537with outlets/pores to produce bubbles 538 when air is fed into themanifold 536. The rising bubbles 538 form a projection screen/surface524 on the water surface 222 of body 220.

The manifold 536 is sloped or angled (i.e., at an angle, θ, relative tohorizontal or, in this case, the bottom 212), and the angle, θ, causesone end of the manifold 536 to be at a first depth, d₁, and a second endof the manifold 536 to be at a second depth, d₂, that is greater thanthe first depth, d₁. In this way, the bubbles at the first end reach thesurface more quickly such that the projection surface 524 above thisfirst end of the manifold 536 is created first when the bubbles 538 areoutput from the manifold 536 and is also removed or destroyed first.

In this way, the projection surface 524 is provided in a wipe on manner(and an image projected on the surface 524 may also be wiped on) and ina wipe off manner (and an image projected on the surface 524 may also bewiped off or faded out in a directional manner over time). The slope orangle, θ, may be varied to create a desired effect, but some embodimentsuse an angle, θ, in the range of 15 to 60 degrees with 30 to 45 degreesbeing preferred in some cases. In other embodiments, the differingdepths may be provided in two or more sections without use of a slopedmanifold, such as with raised or lowered portions (tubes/pipes) tocreate desirable effects with a varying projection surface/screen 524.

FIG. 6 illustrates another embodiment of a water surface projectionsystem 600 similar to that shown in FIG. 3. The system 600 includes anumber of the same components as system 200 of FIG. 3, and thesecomponents are given like numbers and not described further. Theprojection system 600 includes an aeration system 630 that has aninlet/control valve 632 and an inlet/feed line 634 providing a flow ofpressurized air.

The system 600 differs from system 200 in its configuration of thedistribution manifold or array 636. The manifold 636 includes a pair ofmanifold headers 637 that extend the length of the manifold 636 and arerigidly mounted at a depth in the water 220 such as on the innersurfaces of sidewalls 214. The bubbles 639 are output from these headers637 via a number of nozzles 638 fed pressurized air by the headers 637.This embodiment 600 may be thought of as the “under water nozzle array,”and air is forced at high pressure through aeration nozzles 638 sobubbles 639 move horizontally as they rise to the surface 222 to createthe projection screen 624.

The resulting projection screen 624 may be less uniform than thoseprovided by other described aeration systems, but the projection screen624 may be useful for providing a projection surface extending away fromthe edges of the body of water and is especially useful for creating aprojection surface in a body of water that is very deep or in which itis difficult to mount equipment to the bottom. In other embodiments, thewidth of the channel or body of water 220 and/or pressure of the air(and/or design of the nozzles 638) are selected to have the bubbles 639from the nozzles 638 on each sidewall 214 overlap at the center of thechannel/body of water 220 to provide a contiguous screen/surface 624.

In some cases, it may be desirable to provide a projection screen thatis present or available wherever a boat or other floating structure islocated in a body of water (e.g., can be generated adjacent to orproximate to the boat). For example, it may be useful to be able toproject on water proximate to a boat as it travels along a ride path oracross a body of water. To this end, the projection assembly may befixed in particular locations or be provided on the moving boat orfloating structure and the surface agitation mechanism(s) are providedon the boat (or towed behind/pushed in front of the boat).

For example, FIG. 7 illustrates a liquid surface projection system 700similar to that of FIG. 3. In this case, though, the aerationassembly/system 730 is provided within the boat 780. The aeration system730 would include a pressurized air source (not shown) and manifold 736with outlets on the hull of the boat 780 to discharge pressurized air toform jets of bubbles 737 that float to the surface 222 to form aprojection surface 724 in the body of water 220. The projectors 254, 380can then be selectively operated to project images/light upon thesurface 724 and display images/lights adjacent the boat 780, which maybe moved about the surface 222 in the body of water 220.

The aeration system 730 may be operated in a manner that is synchronizedto the location and operation of projectors 254, 380 such as by creatingbubbles 737 and surface 724 only when the boat 780 is in an area ofwater 220 that is a focus point/location for the projectors 254, 380. Inthis manner, a movable or portable projection screen can be provided foruse with nearly any body of water (e.g., useful on lakes, rivers, andeven the ocean (such as by cruise ships or the like)). In someembodiments, the air nozzles/manifold 736 on the boat 780 may becontrolled by the passengers 382 with a user input device in/on the boat780. The passenger 382 may then selectively create the projectionsurface 724, which would cause projected content to be displayed (e.g.,to “paint the water surface” near the boat with colored light, to revealobjects such as sunken treasure, fish, swimming or displayedcharacters/information, and so on).

Although the invention has been described and illustrated with a certaindegree of particularity, it is understood that the present disclosurehas been made only by way of example, and that numerous changes in thecombination and arrangement of parts can be resorted to by those skilledin the art without departing from the spirit and scope of the invention,as hereinafter claimed. The projection systems and methods may have anumber of commercial applications such as in residential or publicswimming pools, in public or residential fountains, and so on. Theprojected content is useful for pure entertainment, but the projectionsystems may also be used to provide advertising/marketing content (suchas in the fountain of a mall). The air flow in the aeration systems maybe kept constant (e.g., a relatively stable air pressure duringoperations) or the air flow may be varied to fade the projection screendensity in and out (provide fewer or more bubbles over time to vary thedisplay surface and create a hazier or clearer image over time). Theprojector may be moved (or more than one projector used) such that thedisplayed images move about the projection surface, which may be usefulfor projection surfaces that have “dead spots” where bubbles are not asprevalent.

The projection methods and systems described herein provide a number ofadvantages and have unique aspects and/or features not available inother projection techniques. The generated projection surface ispermeable such that objects, vehicles, and people may move through it.The projection systems allow display designers to create unique andinfinitely variable projection surfaces (e.g., due to the variability ofthe surface the image appears to change over time and will vary eachtime it is projected and experienced by a viewer). The projection systemallows shows or displays to be provided in areas and locations thattypically could not be utilized (e.g., within the reach of individualsin a vehicle or within the vehicle's envelope as the vehicle may floatover a projection surface/screen while it is in use to display aprojected image).

The projection systems can be used to change a vehicle passenger'sperception of vehicle speed by projecting a water/ground surface motion.A vehicle will be perceived as being stopped, moving more quicklyforward, or even moving backward by causing images to move past thevehicle (or to move with the vehicle) at relative speeds. The projectionscreen allows numerous images or items to be projected upon a liquid'ssurface such as obstacles for a vehicle, characters, graphics, text, awhirlpool or rapids for a raft/boat ride, and so on. The fluid's make upmay even appear to be changed by the projected images such as from waterto fluid lava, clouds, mercury, and other flowing materials. Theprojection surfaces may be used to cause objects or characters to appearto be under the surface of the body of the water. The projection systemscan be used to provide dramatic space transformations (e.g., a vehiclemay be transported from a lagoon filled with water to outer space byprojecting a star field or “land” onto the water).

The projected content may be selected to create a desired effect ordisplay. The content may be readily changed to provide seasonaloverlays. In other cases, the projection surface location and contentcould be chosen to show graphical waypoints in front of a boat or anactual path of a boat on the water surface. A branching path or falsepath could be shown indicating a wrong or off-path way the boat may go(e.g., into a dangerous obstacle or attaching character/animal). In oneproposed embodiment, a boat is moving across a large lagoon or body ofwater with a large projected surface such that the boat appears to sailthrough a desired environment (such as a garden or desert) or through aprojected maze (e.g., with a track indicating the correct path tofollow).

The projection surface with or without projected content/images can beutilized to hide underwater equipment such as that used to move a boatthrough the water. The water surfaces texture or make up can be changed,e.g., from water to a dissolving surface, to a solid deck/ground, toice, and so on. The content can even make the depth of the water appearto change or vary about the boat.

The projection system may be operated in an interactive manner. Forexample, the passengers may use user input devices on the boat orsticks, paddles, and so on to touch the water surface in the projectionsurface (with such movements being tracked) to caused a reaction orchange in the projected content such as to create objects (e.g., paint alily pad on the water surface), to scare objects away, or to moveprojected objects. In other embodiments, the boat may include squirtguns to allow passengers to squirt targets in/on the water (e.g., in theprojected image/content on the projection surface) or the boat mayinclude nozzles on the front of the boat to act as an icebreaker/melting device such that the boat can push bubbles forming theprojection surface and projected images out of the way.

The projected content can provide “reflections” or displays of manydifficult to build or otherwise simulate objects or creatures such thatthe objects/creatures appear to be over the heads of the passengers andthe boat. The content may simulate special effects such as enhancing anexplosion, fire, and the like on the water surface. The content may varywidely to practice the invention such as to include text, directions,clues, gaming instructions, point totals for a boat during a game, andthe like. The projected imagery may also provide bioluminescenceeffects, glowing trails, streaks, wakes, paths, light cycles/boats, andso on.

1. A projection system for projecting upon an upper surface of liquid,comprising: a surface agitation assembly selectively operable to agitatea portion of the upper surface of liquid to form a projection screen;and a projector assembly projecting light onto the projection screen onthe upper surface of the liquid, wherein the liquid is at leasttranslucent to light and wherein the projection screen on the uppersurface reflects a portion of the projected light.
 2. The system ofclaim 1, wherein the liquid is water in an open container and whereinthe upper surface is substantially planar.
 3. The system of claim 1,wherein the surface agitation assembly comprises a wave generatorsystem.
 4. The system of claim 3, wherein the wave generator system isselectively operable to create rows of standing waves or a surfaceroughness in the portion of the upper surface, whereby the projectionscreen is selectively generated and removed from the upper surface. 5.The system of claim 3, wherein the wave generator system comprises firstand second wave generators creating a cross-hatch pattern of waves inthe portion of the upper surface to form the projection screen.
 6. Thesystem of claim 3, wherein the wave generator system is operable todefine an amount or size of wave peaks or wave intersections in theportion of the upper surface.
 7. The system of claim 3, wherein the wavegenerator system is operable to modify over time the amount or the sizeof the wave peaks or wave intersections.
 8. The system of claim 1,wherein the projector assembly comprises a projector projecting a stillor video image upon the projection assembly.
 9. The system of claim 1,further comprising a vehicle floating on the upper surface of theliquid, wherein the surface agitation assembly is mounted on thevehicle.
 10. A display system, comprising: an open container forreceiving a volume of a liquid; a wave generator system operable tocreate a projection screen by creating a surface roughness on an area ofan upper surface of the liquid, whereby light is reflected back from theupper surface; and a projection assembly focusing light into the opencontainer onto the created projection screen.
 11. The display system ofclaim 10, wherein the liquid is at least translucent to light prior tooperation of the wave generator system to create the projection surfaceand wherein the surface roughness is great enough that the liquid in thearea of the upper surface reflects at least a portion of the focusedlight from the projection assembly.
 12. The display system of claim 10,wherein the wave generator system creates rows of standing wavesproviding the surface roughness in the area of the upper surface. 13.The display system of claim 12, wherein the wave generator systemincludes at least two wave generators configured to operate concurrentlyto create a cross-hatch pattern of waves in the area of the uppersurface.
 14. The display system of claim 13, wherein the wave generatorsystem operates to modify at least one of size and number of wave peaksor intersections in the area to modify the surface roughness duringoperation of the projection assembly to focus the light into the opencontainer.
 15. A method of projecting on a translucent surface of a bodyof water, comprising: positioning a surface agitation assembly in orproximate to the body of water; operating the surface agitation assemblyto form a projection screen in a portion of an upper surface of the bodyof water; and projecting light upon the portion of the surface of thebody of water, whereby at least a portion of the light is reflected toan observer due to an increase in a surface roughness of the uppersurface by the surface agitation assembly.
 16. The method of claim 15,wherein the projected light includes a video image.
 17. The method ofclaim 15, further including moving a passenger boat through the portionof the surface of the body of water during the projecting of the light.18. The method of claim 17, wherein the surface agitation assembly ismounted on the passenger boat.
 19. The method of claim 18, wherein theoperating of the surface agitation assembly performed in response tooperation of a user input device by a passenger of the passenger boat.20. The method of claim 15, wherein the operating of the surfaceagitation assembly is varied over a period of time, whereby an amount orrate of agitation of the portion of the upper surface is varied over thetime period.
 21. The method of claim 15, wherein the projecting of thelight includes moving one or more images to differing locations withinthe portion of the surface of the body of water.
 22. The method of claim15, wherein the surface agitation assembly comprises a wave generatorsystem.
 23. The method of claim 22, wherein the wave generator system isselectively operable to create rows of standing waves or a surfaceroughness in the portion of the upper surface, whereby the projectionscreen is selectively generated and removed from the upper surface. 24.The method of claim 22, wherein the wave generator system comprisesfirst and second wave generators creating a cross-hatch pattern of wavesin the portion of the upper surface to form the projection screen. 25.The method of claim 22, wherein, during the operating, the wavegenerator system operates to define an amount or size of wave peaks orwave intersections in the portion of the upper surface.